El Seed is a walking humanoid sunflower who speaks with a faint Spanish accent and wears a lime-green bullfighter's suit. He hates all non-plant life-forms, particularly humans whom he usually refers to as "monkeys", and intends to eliminate them all so that plants may rule the world again. He never actually fights but creates various forms of plant monsters using chemical concoctions to do his dirty work.

El Seed is served by two women called the Bee Twins; identical twins in bee costumes (with wings that let them fly) who speak in unison.

El Seed's name is a parody of the historical figure El Cid who was a Spanish knight in the crusades.